[mythtv-users] auto frame rate change

[Jason Kitching]

The driver will just add your custom modelines to the total pool of
available modes unless you tell it to ignore the others..

Unless this "VertRefresh     56.0 - 62.0" is being ignored because it
does not compute with the custom modelines then you're getting 60Hz
output only.
You can read thru' /var/log/Xorg.0.log file to find out..

> snip..
>> Remove (comment out) the interlaced modelines because the video card
>> should be better than the TV.
>>
>> The remaining 2 modelines are not right, they are just made up for some
>> old projector (VGA possibly).
>> The ~60Hz one should be using reduced vertical blank timing:
>> Modeline "1920x1080R"  138.50  1920 1968 2000 2080  1080 1083 1088 1111
>> +hsync -vsync
>>    and the 50Hz one:
>> Modeline "1920x1080_50.00"  141.50  1920 2032 2232 2544  1080 1083 1088
>> 1114 -hsync +vsync
>>
>> Blm
>>
>> ---------------------
>>
>> Followed that Blm, thanks, can see the default change to 60Hz but 24fps
>> still being forced so I checked /var/log/Xorg.0.log and found that
>> nvidia-auto-select kicks in and sets the res to 1920_1080_24.
>>
>> Some mix of these options (in xorg.conf) should prevent the auto-select
>> mode:
>>
>> Option "ModeValidation" "DFP-1: AllowNonEdidModes, NoXServerModes,
>> NoVesaModes, NoEdidModes, NoPredefinedModes"
>>
>> Thnks for the help and the link, most helpful. This reply is simply a note to say thanks for your efforts and for info.
>>
>> I can now disable 24fps with the Option line of either
>> Option "UseEdidFreqs" "boolean"
>>       Option "UseEDID" "FALSE"
>>       Option "UseEDIDFreqs" "FALSE"
>>
>> The screen sets to 60hz but 50hz now no longer works. The /var/log/Xorg.0.log shows no valid modes for 1920x1080_50+0+0 ignoring. If I then disable the option lines the 1920x1080_50 line validates as does the 1920x1080_60 line. Guess there must be a hardware glitch somewhere that prevents it reporting correctly. I've now spent the best part of a week trying to figure it out and tbh it's now not worth the effort. Far simpler just changing from Auto to 60hz in mythtv for when I play 24fps media.
>>
> The option UseEDID is a blunt hammer (that I use too), the
> ModeValidation seems more of a controlled approach.
>
> This line has to change if EDID frequency info is set to ignored because
> it prevents 50Hz modes on that screen.
> "VertRefresh     56.0 - 62.0"
That sorted it. Thanks, much appreciated. Couldn't see the wood for the 
trees. Set the VertRefresh to 48 and now auto switches from 50 to 60hz 
without issue.

Thanks again.